fontFactory.setMaxSize(font_max_size);
fontFactory.setMinSize(font_min_size);
configurableCaptchaService.setFontFactory(fontFactory);
// 随机字符生成器,去除掉容易混淆的字母和数字,如o和0等
wordFactory = new RandomWordFactory();
wordFactory.setCharacters(code);
wordFactory.setMaxLength(font_max_num);
wordFactory.setMinLength(font_min_num);
configurableCaptchaService.setWordFactory(wordFactory);